Which of the following could result from a dysfunction of cranial nerve (CN) IV?

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Cranial nerve IV, also known as the trochlear nerve, innervates the superior oblique muscle of the eye. Dysfunction of this nerve can lead to diplopia (double vision) because the superior oblique muscle helps to depress, abduct, and internally rotate the eye. When this muscle doesn't function properly, the affected eye cannot move correctly, leading to misalignment of the visual axes and double vision.

Which of the Following Could Result from a Dysfunction of Cranial